ARM: shmobile: r7s72100: Add shmobile_init_late()

Extend r7s72100 SoC machine vector to include shmobile_init_late()
so Suspend-to-RAM and CPUIdle are setup as expected.

Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>